Fujitsu AS* G09LECB Service Instruction page 20

3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
O
utside temp. > -10°C
Tn -Tn10<-5deg Tn < - 17°C
=
Tn -Tnb <-2deg
However,Tn< 6°C
=
Heating operation start : Compressor ON
Normal defrost
Outside temp.< -20°C
=
-20
°C< Outside temp.< -10°C
=
Tn <
=
Outside temp.- 7°C
or
Tn < - 20°C
=
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Outdoor HEX temp.: Over 16°C
Compressor ON time: Maximum 15 minutes
(Not defrosted for 10 minutes)
Intermittent operation
Compressor
OFF count :
Tn <
40 times
=
Outside temp.- 7°C
(Less than 10min.)
or
Tn < - 30°C
=
Defrost start
Outdoor fan : OFF
Compressor speed : 0 rps
EEV : 480pulse
4-way valve : OFF
Compressor speed : 90rps
or
Defrost end
01-17
Integrating defrost
Continuous operation
Compressor Compressor
integrating integrating
operation: operation:
Over 240 min. Over 213 min.
Outdoor Outdoor
heat exchanger heat exchanger
temperature: temperature:
Below - 3°C Below - 5°C